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authorko1 <ko1@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2015-08-21 11:30:24 +0000
committerko1 <ko1@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2015-08-21 11:30:24 +0000
commit885d781abcfce71458b705d227cb719b8d045214 (patch)
tree83582e2545ff4ad7e3c37770bf0dae3bbce94e61 /ext/objspace
parent18d8ba2594fda072bb8308f096bbe30c52b92d3c (diff)
* ext/objspace/objspace.c: add a new method ObjectSpace.count_symbols.
[Feature #11158] * symbol.c (rb_sym_immortal_count): added to count immortal symbols. * symbol.h: ditto. * test/objspace/test_objspace.rb: add a test for this method. * NEWS: describe about this method. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51654 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'ext/objspace')
-rw-r--r--ext/objspace/objspace.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/ext/objspace/objspace.c b/ext/objspace/objspace.c
index 08d41b8..eff9d0c 100644
--- a/ext/objspace/objspace.c
+++ b/ext/objspace/objspace.c
@@ -18,6 +18,7 @@
#include <ruby/re.h>
#include "node.h"
#include "gc.h"
+#include "symbol.h"
/*
* call-seq:
@@ -249,6 +250,84 @@ count_objects_size(int argc, VALUE *argv, VALUE os)
return hash;
}
+struct dynamic_symbol_counts {
+ size_t mortal;
+ size_t immortal;
+};
+
+static int
+cs_i(void *vstart, void *vend, size_t stride, void *n)
+{
+ struct dynamic_symbol_counts *counts = (struct dynamic_symbol_counts *)n;
+ VALUE v = (VALUE)vstart;
+
+ for (; v != (VALUE)vend; v += stride) {
+ if (RBASIC(v)->flags && BUILTIN_TYPE(v) == T_SYMBOL) {
+ ID id = RSYMBOL(v)->id;
+ if ((id & ~ID_SCOPE_MASK) == 0) {
+ counts->mortal++;
+ }
+ else {
+ counts->immortal++;
+ }
+ }
+ }
+
+ return 0;
+}
+
+size_t rb_sym_immortal_count(void);
+
+/*
+ * call-seq:
+ * ObjectSpace.count_symbols([result_hash]) -> hash
+ *
+ * Counts symbols for each Symbol type.
+ *
+ * This method is only for MRI developers interested in performance and memory
+ * usage of Ruby programs.
+ *
+ * If the optional argument, result_hash, is given, it is overwritten and
+ * returned. This is intended to avoid probe effect.
+ *
+ * Note:
+ * The contents of the returned hash is implementation defined.
+ * It may be changed in future.
+ *
+ * This method is only expected to work with C Ruby.
+ *
+ * On this version of MRI, they have 3 types of Symbols (and 1 total counts).
+ *
+ * * mortal_dynamic_symbol: GC target symbols (collected by GC)
+ * * immortal_dynamic_symbol: Immortal symbols promoted from dynamic symbols (do not collected by GC)
+ * * immortal_static_symbol: Immortal symbols (do not collected by GC)
+ * * immortal_symbol: total immortal symbols (immortal_dynamic_symbol+immortal_static_symbol)
+ */
+
+static VALUE
+count_symbols(int argc, VALUE *argv, VALUE os)
+{
+ struct dynamic_symbol_counts dynamic_counts = {0, 0};
+ VALUE hash = setup_hash(argc, argv);
+
+ size_t immortal_symbols = rb_sym_immortal_count();
+ rb_objspace_each_objects(cs_i, &dynamic_counts);
+
+ if (hash == Qnil) {
+ hash = rb_hash_new();
+ }
+ else if (!RHASH_EMPTY_P(hash)) {
+ st_foreach(RHASH_TBL(hash), set_zero_i, hash);
+ }
+
+ rb_hash_aset(hash, ID2SYM(rb_intern("mortal_dynamic_symbol")), SIZET2NUM(dynamic_counts.mortal));
+ rb_hash_aset(hash, ID2SYM(rb_intern("immortal_dynamic_symbol")), SIZET2NUM(dynamic_counts.immortal));
+ rb_hash_aset(hash, ID2SYM(rb_intern("immortal_static_symbol")), SIZET2NUM(immortal_symbols - dynamic_counts.immortal));
+ rb_hash_aset(hash, ID2SYM(rb_intern("immortal_symbol")), SIZET2NUM(immortal_symbols));
+
+ return hash;
+}
+
static int
cn_i(void *vstart, void *vend, size_t stride, void *n)
{
@@ -887,6 +966,7 @@ Init_objspace(void)
rb_define_module_function(rb_mObjSpace, "memsize_of_all", memsize_of_all_m, -1);
rb_define_module_function(rb_mObjSpace, "count_objects_size", count_objects_size, -1);
+ rb_define_module_function(rb_mObjSpace, "count_symbols", count_symbols, -1);
rb_define_module_function(rb_mObjSpace, "count_nodes", count_nodes, -1);
rb_define_module_function(rb_mObjSpace, "count_tdata_objects", count_tdata_objects, -1);
rb_define_module_function(rb_mObjSpace, "count_imemo_objects", count_imemo_objects, -1);